Building A Permanent Electric Fence - Datamars Unigizer 12000i Mode D'emploi

Building a permanent
electric fence
Components of an electric fence
An electric fence system comprises the following elements:
An energizer.
•
An earth system.
This comprises a number of metal rods
•
inserted into the ground, which are connected to the Fence
earth terminal on the energizer.
Insulated underground cables.
•
insulated plastic, suitable for use underground or going
through walls. Used to connect the energizer to the earth
and fence.
An insulated fence.
Connected to the Fence output
•
terminal of the energizer. Fences can be made to a variety
of designs (see below).
Other useful components that can be added:
Cut-out switches
intervals, these allow you to isolate sections
of the fence for repair.
Lightning diverter kit
damage to your energizer from lightning
conducted down the fence line.
Typical installation
For an electric fence to give an electric shock, the current
produced by the energizer must complete a full circuit. The
current leaves the energizer and moves along the fence wires
through the animal, into the soil and back to the energizer via
the earth system. If the earth system is ineffective, the animal
will receive an inadequate shock. The fence below has all live
wires and requires conductive soils. This type of earthing
system is often referred to as an 'all-live' or 'earth-return'
earthing system.
Electric fence wire coated in
. Installed at regular
. Used to minimise the
Alternative installation
Dry, sandy or non-conductive soil (e.g. volcanic soil) provides
ineffective earthing. For this type of soil it is a good idea to use
additional earth rods, choose a better location for the earth
system (such as damp soil), or use a 'fence-return' or 'earth-
wire-return' earthing system.
For a 'fence-return'/'earth-wire-return' earthing system, the
Fence earth terminal is connected directly to at least one non-
electrified fence wire (earth wire). The animal gets maximum
shock from touching a live wire and an earth wire at the same
time.
Bi-polar installation
In areas with poor earthing conditions, a 'bi-polar' installation
may be used to enhance the performance of the fence. With a
bi-polar installation, all fence wires are insulated. Alternate
fence wires are interconnected to form one negatively charged
circuit and one positively charged circuit. The energizer passes
half the output voltage to the negatively charged wires and half
the output voltage to the positively charged wires. The animal
gets a shock from touching a positive wire or a negative wire
OR, if touching both a positive and negative wire
simultaneously it gets a stronger shock.
To construct a bi-polar fence:
1 Interconnect fence wires so that there are two different
circuits, as shown in the diagram.
2 Connect the Fence half voltage terminal (yellow) to the
earth system using insulated cable.
3 Connect the Fence earth terminal (green) to the negative
wires.
4 Connect the Fence full voltage terminal (red) to the
positive wires.
Note:
The earth monitoring feature cannot be used with a bi-
polar installation.
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